Deep Extragalactic VLBI-Optical Survey (DEVOS): I. Pilot MERLIN and VLBI observations

L. Mosoni, S. Frey, L. I. Gurvits, M. A. Garrett, S. T. Garrington, Z. I. Tsvetanov

Research output: Contribution to journalArticle

10 Citations (Scopus)


We present the results of the pilot observations of the Deep Extragalactic VLBI-Optical Survey (DEVOS). Our ultimate aim is to collect information on compact structures in a large sample of extragalactic radio sources (∼104 objects) up to two orders of magnitude fainter than those studied in typical imaging Very Long Baseline Interferometry (VLBI) surveys up until now. This would lead to an unprecedented data base for various astrophysical, astrometric and cosmological studies. The first global VLBI observations of the DEVOS programme were successfully conducted in May 2002. We selected sources without any spectral criterion from the Very Large Array (VLA) Faint Images of the Radio Sky at Twenty-centimeters (FIRST) catalogue, that are also detected with the Multi-Element Radio Linked Interferometer Network (MERLIN). The DEVOS pilot sample sources are in the area of the sky that is covered by the Sloan Digital Sky Survey (SDSS). We describe the sample selection and present high resolution 5-GHz radio images of the sources. Based on the results of this pilot study, we estimate the outcome of and the resources needed for a full-scale DEVOS project.

Original languageEnglish
Pages (from-to)413-422
Number of pages10
JournalAstronomy and Astrophysics
Issue number2
Publication statusPublished - 1 Jan 2006



  • Galaxies: active
  • Quasars: general
  • Radio continuum: galaxies
  • Surveys
  • Techniques: interferometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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